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Method for measuring dissolution amount of PVA optical film

An optical film and solution technology, applied in the field of polarizers, can solve the problems of polluting polarizer dyeing tanks, uneven dyeing of PVA films, and failure to measure the dissolution of PVA optical films.

Pending Publication Date: 2020-06-26
ANHUI WANWEI UPDATED HIGH TECH MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the manufacturing process of polarizing film, PVA film will have dissolved substances, such as added additives and small molecules in PVA film, which will pollute the downstream dyeing tank for polarizer production
Moreover, if too many small molecules are dissolved in the PVA film, it will cause uneven dyeing of the PVA film, so it is necessary to measure the amount of PVA dissolved in the PVA film.
[0004] However, there is no effective method for measuring the dissolution rate of PVA optical film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Step 1, the preparation of PVA standard solution: take by weighing 20mg of PVA, add in the volumetric flask of 100mL, constant volume 100mL with distilled water, the preparation concentration is the PVA solution of 200mg / L, use it as mother liquor preparation concentration in 10mg / L to A series of PVA standard solutions in the range of 150mg / L (150mg / L, 120mg / L, 100mg / L, 80mg / L, 60mg / L, 50mg / L, 40mg / L, 30mg / L, 20mg / L, 10mg / L L).

[0023] Step 2. Add 30.0 g of boric acid to 1000 mL of water, shake well to obtain a 30.0 g / L boric acid solution; add 10.0 g of iodine and 25.0 g of potassium iodide to 1000 mL of water, shake well to obtain an iodine-potassium iodide solution, wherein the iodine concentration is 10.0 g / L, potassium iodide concentration is 25.0g / L; Boric acid solution and iodine-potassium iodide solution are mixed and shaken by volume ratio 3:1, obtain chromogenic solution;

[0024] Step 3, drawing of the standard relationship curve between absorbance and PV...

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Abstract

The invention discloses a method for measuring the dissolution amount of a PVA (Polyvinyl Alcohol) optical film, which comprises the following steps: soaking a PVA optical film to be measured in waterto prepare an extracting solution to be measured; taking a mixed solution of a boric acid solution and an iodine / potassium iodide solution as a chromogenic solution, adding the chromogenic solution into the to-be-detected extracting solution, then determining the absorbance, and obtaining the concentration of PVA in the to-be-detected extracting solution according to the standard relation curve of the absorbance and the concentration of PVA, thereby calculating the dissolution amount of the PVA optical film. According to the method, trace detection of PVA in the solution can be simply and efficiently realized, the dissolution amount of the PVA optical film can be quickly measured, and the method has guiding significance for evaluating the product quality of the PVA optical film.

Description

technical field [0001] The invention belongs to the field of polarizers, and in particular relates to a method for measuring the dissolution amount of a PVA optical film. Background technique [0002] Polarizers are the core components for the production of LCD panels, and polyvinyl alcohol (PVA) optical films are key materials for the production of polarizers. Nowadays, the demand for large-size liquid crystals is increasing, and more and more new products are being developed, such as the mainstream of next-generation displays: Active Matrix Organic Light-Emitting Diode (AMOLED) displays, which are flexible and ultra-thin , which has very strict requirements on the raw materials of each link, especially the PVA optical film in the upstream of the industrial chain. [0003] The existing method for producing polarizers is to pre-swell the formed PVA film, dye it with iodine, uniaxially stretch it, and cure it with boric acid to form a polarizer film, and then attach a triace...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N1/30
CPCG01N21/31G01N1/30
Inventor 唐成宏吴云柱向学毅刘密密陈玉春
Owner ANHUI WANWEI UPDATED HIGH TECH MATERIAL CO LTD
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